#app {
  display: flex;
  /* flex 水平居中 */
  justify-content: center;
}
#app h3 {
  text-align: center;
}
/* 表格样式 */
table {
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
  font-size: 14px;
}
table th,
table td {
  padding: 8px 15px;
  border: 1px solid #e9e9e9;
  text-align: left;
}
table th {
  background-color: #f7f7f7;
  color: #5c6b77;
  font-weight: 500;
}
button {
  outline: none;
  border: 1px solid #087b83;
  border-radius: 4px;
  cursor: pointer;
  background-image: linear-gradient(to top, #ffffff, rgba(230, 228, 228, 0.5));
}
